| Milu Oy | Professional & scientific | 2020 |
| Muottikiillotus, Polysteel Ky | Manufacturing | 1982 |
| Myrobo Oy | Professional & scientific | 2009 |
| Myötäkunto Oy | Health & social care | 2017 |
| Nacoltuote Oy | Real estate | 1979 |
| Naturwe Oy | Professional & scientific | 2020 |
| Neatig Oy | Information & communication | 2018 |
| Neorem Magnets Oy | Manufacturing | 1989 |
| Neuvo Oy Global | Information & communication | 2019 |
| Niemenoja/Salonen Oy | Real estate | 2008 |
| Nordagent Oy | Wholesale & retail | 2017 |
| Nordinox Metals Oy | Manufacturing | 2000 |
| Nordinox Oy | Wholesale & retail | 1986 |
| Nordinox Steel Oy | Wholesale & retail | 2016 |
| North Copper Oy | Wholesale & retail | 2021 |
| Novapolar Oy | Professional & scientific | 1993 |
| Nurmi Engineering Oy | Professional & scientific | 2011 |
| NurmiUkko OY | Administrative & support | 2025 |
| OMG Finland Oy | Financial services | 2000 |
| Olivier Jullian Consultant Oy | Information & communication | 2023 |
| OmaColor Oy | Construction | 2021 |
| Osuuskunta Satamaito | Manufacturing | 1981 |
| Oy Alakiikonen Ab | Construction | 2021 |
| Oy Hollmén & Co | Manufacturing | 1993 |
| P2 Engineering Oy | Manufacturing | 2016 |
| Palstasuuli OY | Administrative & support | 2012 |
| PN-Moniala Oy | Hospitality | 2004 |
| Prime Time Juhlat Ky | Hospitality | 1989 |
| PV Bank Partners Oy | Financial services | 2025 |
| Pacetti Oy | Hospitality | 2010 |
| PatinaWilla Oy | Other services | 2025 |
| Payloq Oy | Information & communication | 2026 |
| Piikun Ruokala Oy | Hospitality | 2023 |
| Piir-Group Oy | Professional & scientific | 1991 |
| Pitoa Oy | Financial services | 2026 |
| Porin Aaps Oy | Real estate | 1996 |
| Porin Ajo-Expert Oy | Education | 1997 |
| Porin Karhuteräs Oy | Manufacturing | 1974 |
| Porin Pitokokit Oy | Hospitality | 2008 |
| Porin Purku ja Saneeraus Oy | Construction | 1999 |
| Poshshop Oy | Wholesale & retail | 2020 |
| Proo Oy | Construction | 2025 |
| Psykologi Käpynen Oy | Health & social care | 2024 |
| Psykoterapia Voimavirta Oy | Health & social care | 2024 |
| Psykoterapiapalvelu Teija Maarit Oy | Health & social care | 2013 |
| Puheterapiapalvelut Satakieli Oy | Health & social care | 2015 |
| Puistolantien Auto Oy | Transport & logistics | 2003 |
| Päärnäisten Kauppahuone Oy | Manufacturing | 2018 |
| Q-Furnisher Oy | Wholesale & retail | 1989 |
| Q4 Kiinteistöt Oy | Real estate | 2010 |
| Rakennuspalvelu Lindholm OY | Construction | 2007 |
| RC-Infra OY | Real estate | 2009 |
| RN Detailing Service Oy | Administrative & support | 2020 |
| RPL Halli OY | Construction | 2010 |
| Rahkola ja Lautamäki Kiinteistöt Oy | Real estate | 2013 |
| Raidetekniikka Schmidt Oy | Professional & scientific | 2012 |
| Rakdive Oy | Construction | 2018 |
| Rakennus Kivikoski Oy | Construction | 2021 |
| Rakennus Ruusela Oy | Construction | 2014 |
| Rakennusinfo Group Oy | Information & communication | 2023 |
| Rakennusliike Koivunen Oy | Construction | 1993 |
| Rakennusliike Mannonen Oy | Construction | 2017 |
| Rakennusliike R.Kivistö Oy | Construction | 2022 |
| Rakennuspalvelu M. Kallioinen Oy | Construction | 2002 |
| Rakennustyöt Hietava Oy | Construction | 2022 |
| Rakennusurakointi Uusitalo Oy | Construction | 2006 |
| Raktec Oy | Information & communication | 2024 |
| Rantanen Accounting & Consulting Oy | Professional & scientific | 2013 |
| Rantasivula Oy | Professional & scientific | 2011 |
| Remonttipalvelu R.Rantala Ky | Construction | 2012 |
| Robecorp Oy | Manufacturing | 1989 |
| Romutar Oy | Wholesale & retail | 2021 |
| S-H Service Oy | Agriculture & fishing | 2004 |
| S.I. Konsult Oy | Professional & scientific | 1990 |
| Saraca OY | Manufacturing | 2025 |
| Sasa-Palvelut OY | Wholesale & retail | 2013 |
| SCM Finland Oy | Construction | 2007 |
| SPS Energiapalvelut Oy | Energy | 2005 |
| SPS Yhtiöt Oy | Energy | 1991 |
| STR - SIIVOUSPALVELUT Avoin yhtiö | Administrative & support | 2021 |
| Sallila Energiapalvelut Oy | Information & communication | 2020 |
| Salted Oy | Professional & scientific | 2024 |
| Sanotaas Oy | Health & social care | 2022 |
| Santasen Taksipalvelu Oy | Transport & logistics | 2020 |
| Saraka Kiinteistöt Oy | Real estate | 2012 |
| Saraka Oy | Manufacturing | 2012 |
| Sataenergia Oy | Wholesale & retail | 2007 |
| Sataherkku Oy | Manufacturing | 1977 |
| Satakunnan Markkinointi ja mediakustannus Oy | Information & communication | 2020 |
| Satakunnan Timpurit Oy | Construction | 2025 |
| Scafftech sp. z o.o. /Sivuliike Suomessa | Construction | 2019 |
| Scene Group Oy | Information & communication | 2007 |
| Second Thing Oy | Wholesale & retail | 2021 |
| Serdex Solutions Oy | Wholesale & retail | 2000 |
| Sermatech Oy | Wholesale & retail | 1995 |
| Sermatech Works Oy | Manufacturing | 1976 |
| Sikraft Energia Oy | Professional & scientific | 2015 |
| Sisustaja, Lahtiranta Kommandiittiyhtiö | Wholesale & retail | 1976 |
| Solarkatto Group Oy | Financial services | 2025 |
| Solarkatto Oy | Construction | 2019 |